Anticipation
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The wind up before the pitch, the crouch like a spring before the run or jump, the movement back before the swing. In Animation, the Anticipation of a movement is what creates a more realistic characteristics or the object movements. This form was brought in by the original nine of disney animation, they were inspired by theater for its over dramatic ways of normal movement. Using this principal makes the animation even more realistic with its movement.

Anticipation vs no anticipation

Artist: Alex Harms
Drawn animation